System.FormatException: Input string was not in a correct format. at System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt) at System.Convert.ToDouble(String value) at ListaArticoliOrizzontale..ctor(Int32 idLingua, Int32 count, String isolingua, String id_gruppo, String id_categoria, String id_sottocategoria, String id_marchio, String id_colore, String filtroCapacitaApplicato, Int32 id_pagina, Int32 currentOffset) in http://server/App_Code/ListaArticoliOrizzontale.cs:line 689 at pagina.Page_Load(Object sender, EventArgs e) in http://server/pagina.aspx.cs:line 2650